Preheat the oven to 400 degrees F (200 degrees C).
2
Place ground beef, onion, bread crumbs, milk, Parmesan cheese, Worcestershire sauce, Italian seasoning, oregano, red pepper flakes, salt, garlic salt, and hot pepper sauce into a large bowl; mix until evenly combined.
3
Shape the mixture into 12 meatballs and place onto a baking sheet.
